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  Java线程同步--银行取号叫号业务场景.md
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  <h3 id="示例：线程，并发，同步，队列"><a href="#示例：线程，并发，同步，队列" class="headerlink" title="示例：线程，并发，同步，队列"></a>示例：线程，并发，同步，队列</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span 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class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> weidb.students;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.ArrayBlockingQueue;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Test01</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception&#123;</span><br><span class="line">        <span class="comment">// TODO 最大接收几个用户排队</span></span><br><span class="line">        <span class="type">int</span> <span class="variable">numCount</span> <span class="operator">=</span> <span class="number">4</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 号码池缓存个数</span></span><br><span class="line">        <span class="type">int</span> <span class="variable">numCache</span> <span class="operator">=</span> <span class="number">3</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 起始号码</span></span><br><span class="line">        <span class="type">int</span> numStart= <span class="number">3600</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 实例化： 号码总数，号码池，叫号队列</span></span><br><span class="line">        <span class="type">NumAll</span> <span class="variable">numAll</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">NumAll</span>(numCount,numStart);</span><br><span class="line">        <span class="type">Num</span> <span class="variable">num</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Num</span>(numCache);</span><br><span class="line">        <span class="type">CallNum</span> <span class="variable">callNum</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">CallNum</span>(numCount);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 号码池缓存号码</span></span><br><span class="line">        <span class="keyword">for</span> (<span class="type">int</span> i=<span class="number">0</span>;i&lt;numCache;i++)&#123;</span><br><span class="line">            numStart+=<span class="number">1</span>;</span><br><span class="line">            num.queue.put(numStart);</span><br><span class="line">            numAll.c++;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 并发取号</span></span><br><span class="line">        <span class="type">User</span> <span class="variable">user</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1001</span>,<span class="string">&quot;user01&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user.start();</span><br><span class="line">        <span class="type">User</span> <span class="variable">user2</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1002</span>,<span class="string">&quot;user02&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user2.start();</span><br><span class="line">        <span class="type">User</span> <span class="variable">user3</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1003</span>,<span class="string">&quot;user03&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user3.start();</span><br><span class="line">        <span class="type">User</span> <span class="variable">user4</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1004</span>,<span class="string">&quot;user04&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user4.start();</span><br><span class="line">        <span class="type">User</span> <span class="variable">user5</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1005</span>,<span class="string">&quot;user05&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user5.start();</span><br><span class="line">        <span class="type">User</span> <span class="variable">user6</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">User</span>(<span class="number">1006</span>,<span class="string">&quot;user06&quot;</span>,numAll,num,callNum);</span><br><span class="line">        user6.start();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 唤醒叫号队列</span></span><br><span class="line">        Thread.sleep(<span class="number">2000</span>);</span><br><span class="line">        <span class="keyword">synchronized</span>(callNum) &#123;</span><br><span class="line">            callNum.notifyAll();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// TODO 叫号</span></span><br><span class="line">        <span class="keyword">for</span> (User user1 : CallNum.queueUser)&#123;</span><br><span class="line">            user1.work();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">NumAll</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">int</span>[] all;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">int</span> <span class="variable">c</span> <span class="operator">=</span> <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">NumAll</span><span class="params">(<span class="type">int</span> numCount,<span class="type">int</span> numStart)</span> &#123;</span><br><span class="line">        all = <span class="keyword">new</span> <span class="title class_">int</span>[numCount];</span><br><span class="line">        c = numStart;</span><br><span class="line">        <span class="keyword">for</span> (<span class="type">int</span> i=<span class="number">0</span>;i&lt;numCount;i++)&#123;</span><br><span class="line">            numStart+=<span class="number">1</span>;</span><br><span class="line">            all[i]=numStart;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">Num</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> ArrayBlockingQueue&lt;Integer&gt; queue;</span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">Num</span><span class="params">(<span class="type">int</span> numCache)</span> &#123;</span><br><span class="line">        queue=<span class="keyword">new</span> <span class="title class_">ArrayBlockingQueue</span>(numCache);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">CallNum</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> ArrayBlockingQueue&lt;User&gt; queueUser;</span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">CallNum</span><span class="params">(<span class="type">int</span> numCount)</span>&#123;</span><br><span class="line">        queueUser = <span class="keyword">new</span> <span class="title class_">ArrayBlockingQueue</span>&lt;&gt;(numCount);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">User</span> <span class="keyword">extends</span> <span class="title class_">Thread</span>&#123;</span><br><span class="line">    <span class="type">int</span> id;</span><br><span class="line">    String name;</span><br><span class="line">    NumAll numAll;</span><br><span class="line">    Num num;</span><br><span class="line">    <span class="type">int</span> num_c;</span><br><span class="line">    CallNum callNum;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">toString</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;User&#123;&quot;</span> +</span><br><span class="line">                <span class="string">&quot;id=&quot;</span> + id +</span><br><span class="line">                <span class="string">&quot;, name=&#x27;&quot;</span> + name + <span class="string">&#x27;\&#x27;&#x27;</span> +</span><br><span class="line">                <span class="string">&quot;, num_c=&quot;</span> + num_c +</span><br><span class="line">                <span class="string">&#x27;&#125;&#x27;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">User</span><span class="params">(<span class="type">int</span> id, String name,NumAll numAll, Num num, CallNum callNum)</span>&#123;</span><br><span class="line">        <span class="built_in">this</span>.id = id;</span><br><span class="line">        <span class="built_in">this</span>.name = name;</span><br><span class="line">        <span class="built_in">this</span>.numAll = numAll;</span><br><span class="line">        <span class="built_in">this</span>.num = num;</span><br><span class="line">        <span class="built_in">this</span>.callNum = callNum;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">work</span><span class="params">()</span>&#123;</span><br><span class="line">        System.out.println(num_c+<span class="string">&quot;号，&quot;</span>+name+<span class="string">&quot; 开始办业务&quot;</span>);</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            Thread.sleep(<span class="number">1000</span>);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        System.out.println(<span class="string">&quot;\t&quot;</span>+num_c+<span class="string">&quot;号，&quot;</span>+name+<span class="string">&quot; 业务完成。&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">run</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">synchronized</span> (callNum) &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="comment">// TODO 取号和补充号码池</span></span><br><span class="line">                <span class="built_in">this</span>.num_c = num.queue.take();</span><br><span class="line">                num.queue.put(numAll.c + <span class="number">1</span>);</span><br><span class="line">                numAll.c++;</span><br><span class="line">                <span class="comment">// TODO 打印取到的号码</span></span><br><span class="line">                System.out.println(<span class="built_in">this</span>);</span><br><span class="line">                <span class="comment">// TODO 进入叫号对列</span></span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    CallNum.queueUser.add(<span class="built_in">this</span>);</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">                    System.out.println(<span class="built_in">this</span>.name+<span class="string">&quot;的号码:&quot;</span>+<span class="built_in">this</span>.num_c+<span class="string">&quot;作废，因为今天排队用户已满，明天早点来^_^&quot;</span>);</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="comment">// TODO 等待叫号队列唤醒</span></span><br><span class="line">                callNum.wait();</span><br><span class="line">            &#125;<span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">                e.printStackTrace();</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure> 
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